US5787199A - Apparatus for detecting a foreground region for use in a low bit-rate image signal encoder - Google Patents

Apparatus for detecting a foreground region for use in a low bit-rate image signal encoder Download PDF

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Publication number
US5787199A
US5787199A US08/580,235 US58023595A US5787199A US 5787199 A US5787199 A US 5787199A US 58023595 A US58023595 A US 58023595A US 5787199 A US5787199 A US 5787199A
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region
pixel
current frame
detecting
pixels
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Min-Sup Lee
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WiniaDaewoo Co Ltd
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Daewoo Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
    • G06T7/254—Analysis of motion involving subtraction of images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation

Definitions

  • the present invention relates to a low bit-rate image signal encoder; and, more particularly, to an apparatus for detecting a foreground region included in an image signal.
  • a large amount of digital data is needed to define each video frame signal since a video line signal in the video frame signal comprises a sequence of digital data referred to as pixel values. Since, however, the available frequency bandwidth of a conventional transmission channel is limited, in order to transmit the substantial amount of digital data therethrough, it is inevitable to compress or reduce the volume of data through the use of various data compression techniques, especially in the case of such low bit-rate image signal encoders as those used in video-telephone and teleconference systems.
  • an input video image is first divided into two parts: i.e., a foreground region having moving objects; and a background region which contains no moving objects. Then, the foreground region is divided according to the moving objects; and, three sets of parameters for defining the motion, contour and pixel data of each object are processed through different encoding channels.
  • a change detector is employed to determine changed and unchanged parts of two successive frames by calculating the difference between a current frame and a previous frame on a pixel-by-pixel basis, and the whole of the changed parts is designated as a foreground region and the unchanged parts as the background region.
  • the foreground region detected by the change detector will not always coincide with the whole region taken up by the moving objects. Therefore, the input video image cannot be divided exactly into the foreground and the background regions, tending to deteriorate the performance of the low bit-rate image signal encoder.
  • an apparatus for use in a low bit-rate image signal encoder, for detecting a foreground region in an image signal, wherein the image signal has a number of objects therein and the foreground region has at least one moving object therein, which comprises:
  • a previous frame memory for storing a previous frame of the image signal
  • a current frame memory for storing a current frame of the image signal
  • a change detector for comparing the current frame and the previous frame to detect changed pixels, each changed pixel having a differential luminance value
  • a region detector for detecting an object region occupied by one of the objects in the current frame
  • a foreground/background determinator for counting the number of pixels contained in the object region to determine a first size of the object region; and for counting the number of changed pixels which are located in the object region to determine a second size of the object region; and for comparing the first size with the second size to determine whether the object region is the foreground or the background region.
  • FIG. 1 shows a schematic block diagram illustrating a foreground region detecting apparatus in accordance with the present invention
  • FIG. 2 shows a detailed block diagram of the foreground/background determinator of FIG. 1;
  • FIG. 3 represents two overlapped exemplary regions for describing the foreground/background determinator of FIG. 1.
  • the foreground region detecting apparatus includes a current frame memory 100, a previous frame memory 102, a region detector 104, a change detector 106, a region storage 108 and a foreground/background determinator 110.
  • the current frame memory 100 serves to receive an image signal from a known image source in order to store a current frame.
  • the current frame includes a foreground region having moving objects and a background region having no moving object.
  • the current frame is provided to the previous frame memory 102 and is applied via line L2 to the region detector 104 and the change detector 106.
  • a previous frame of the image signal is stored.
  • the previous frame is provided to the change detector 106.
  • the region detector 104 detects a region occupied by one of the objects in the current frame retrieved from the current frame memory 100.
  • the region is detected as follows: first, a contour of an object in the current frame is detected through the use of a known edge detection technique employing a known edge detection operator, e.g., a sobel operator. Then, the contour is processed to provide region information for defining the region of the object.
  • the region information is applied via L6 to the a region storage 108 wherein each region for each of the moving objects is stored therein.
  • the region information from the region storage 108 is applied to the foreground/background determinator 110 via line L8.
  • the change detector 106 compares the current frame retrieved from the current frame memory 100 with the previous frame from the previous frame memory 102 to detect a changed area in the current frame.
  • the changed area is determined as follows: an absolute value of a difference between a luminance value for each of the pixels of the current frame and that for its corresponding pixel in the previous frame is computed; and then the absolute value is compared with a first threshold value Th1. If the absolute value is larger than or equal to Th1, it implies that there is a change of luminance value and thus a given pixel is included in the changed area. Otherwise, the given pixel is included in the unchanged area.
  • a changed area signal representing the detected changed area is sent via line L10 to the foreground/background determinator 110.
  • the foreground/background determinator 110 in response to the region information from the region storage 108 and the changed area signal from the change detector 106, the number of changed pixels located in a region is counted to determine whether the region is changed or not. If more than a predetermined portion of pixels in a given region are changed pixels, the region will be included in the foreground region. Details of the foreground/background determinator 110 are described with reference to FIG. 2.
  • the changed area signal received via line L10 from the change detector 106 is stored at a changed area storage 202.
  • the region information from the region storage 108 is applied to a region extraction block 203.
  • the region extraction block 203 serially extracts all of the pixels stored in the region storage 108, supplies a pixel position signal representing the position of an extracted pixel via line L22 to the changed area storage 202 and also provides switches 204 and 208 with a switching control signal representing which region the extracted pixel belongs to.
  • the changed area storage 202 responds to the pixel position signal from the region extraction block 203 by generating "0" representing an unchanged area, or "1" representing a changed area.
  • the first switch 204 responds to the switching control signal from the region extraction block 203 by supplying its input, i.e., "0" or "1", to a changed size determinator 206.
  • the changed size determinator 206 has a number of counters, wherein each of the counters counts the number of 1's in its input to determine the size of a changed portion, i.e., the number of changed pixels in the region. The determined size of the changed portion is sent to a ratio calculation block 212.
  • the second switch 208 responds to the switching control signal by supplying its input, i.e., logic high signal "1", to a region size determinator 210.
  • the region size determinator 210 has a number of counters, wherein each of the counters counts the number of 1's in its input to determine the size of a region, i.e., a total number of pixels in the region.
  • the determined size of the region is sent to the ratio calculation block 212.
  • the ratio calculation block 212 has a number of dividers and each of the dividers calculates the ratio of the size of the changed portion to the size of the region. For example, in case of the two regions Rn(t) of a current frame and Rn(t-1) of a previous frame are shown overlapped in FIG. 3, the ratio of the size of the changed portion to the size of the region is the ratio of the hatched area A to the size of the region Rn(t).
  • Each ratio computed by the dividers of the ratio calculation block 212 is provided through a multiplexer 214 to serially apply each ratio to a comparator 216 wherein each ratio is compared with a second threshold value Th2 to determine whether the ratio is larger than Th2. If the ratio is larger than Th2, the corresponding region is classified as a foreground region, otherwise, the region is classified as a background region.
  • the comparison result is provided via line L12 to the region storage 108 wherein the region classified as foreground region is produced.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Image Analysis (AREA)
  • Studio Circuits (AREA)
  • Television Signal Processing For Recording (AREA)
US08/580,235 1994-12-29 1995-12-28 Apparatus for detecting a foreground region for use in a low bit-rate image signal encoder Expired - Fee Related US5787199A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019940038604A KR100235344B1 (ko) 1994-12-29 1994-12-29 영역 분할 부호화 방식의 전경/배경 화상 선택 장치
KR94-38604 1994-12-29

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JP (1) JPH08242449A (ko)
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CN (1) CN1130848A (ko)

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WO2006103594A2 (en) * 2005-04-01 2006-10-05 Koninklijke Philips Electronics N.V. A method, a system and a computer program for segmenting a structure in a dataset
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EP2207137A1 (en) * 2007-09-28 2010-07-14 Hitachi Software Engineering Co., Ltd. Motionlessness deciding method and device for photograph object
US20130194243A1 (en) * 2012-01-27 2013-08-01 Pan-Wook Um Display drive integrated circuit
US20140219582A1 (en) * 2013-02-01 2014-08-07 Htc Corporation Image composition apparatus and method
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EP3068135A1 (en) * 2015-03-10 2016-09-14 Hangzhou Hikvision Digital Technology Co., Ltd. Systems and methods for hybrid video encoding
US10769799B2 (en) 2018-08-24 2020-09-08 Ford Global Technologies, Llc Foreground detection
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KR100614694B1 (ko) * 1999-12-24 2006-08-21 비오이 하이디스 테크놀로지 주식회사 색온도 자동 조절 회로
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CN100420299C (zh) * 2004-12-24 2008-09-17 北京中星微电子有限公司 一种屏幕广播方法
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KR960028480A (ko) 1996-07-22
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KR100235344B1 (ko) 1999-12-15

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